Crusher



Sept. 2 0, 1938. K. MEISTER CRUS HER Filed Jan. 7, 1935 2 Sheets-Sheet 1Patented Sept. 20, 1938 uNiTEo STATES CRUSHER Karl Meister,Magdeburg-Sudenburg, Germany, assignor to the firm Fried. KruppGrusonwerk Aktiengcsellschaft, Magdeburg-Buckau, Germany ApplicationJanuary 7, 1935, Serial No. 795 In Germany January 16, 1934 1 claim.(o1. 8353) My invention relates to crushers having a moveable or rockingjaw and a non-moveable or stationary jaw between which the materialunder treatment is crushed, whereupon the material leaves the crusherthrough a discharge gap at the lower end of the said jaws.

It is well known to those familiar with crushing machinery that thevolume of the material under treatment increases in proportion as it isdisintegrated and the further it is conveyed to the discharge gap. Thusthe work of disintegration increases in the lower part of the crushingzone. As, moreover, small particles distributed in the material beingfed immediately fall down into this lower zone, not only the mostimportant part of the'disintegration work must be executed in this zone,but also an undesired swell of material occurs there. Up till now, thesedisadvantages could be avoided only by reducing the charge of thecrusher, but in this way the capacity of the latter is diminished. Asthe swell of material in the lower part of the crushing zone cannotwholly be avoided in this manner the inferior sections of the crushingjaws wear considerably and a great deal of dust is produced.

In order to avoid these disadvantages, I provide a jaw crusher ofimproved design, the crushing plates of which have an inclined positionand broaden towards their lower ends, 1. e., towards the discharge gapof the crusher, so that the cross section of the crushing zone increasesin the direction of the plates, while it decreases in the directionnormal to them.

Preferably, the inclination of the crushing 535 surfaces varies in thesingle sections, the upper parts of these surfaces forming an acuteangle, the lower ones being nearly parallel to each other. Anotherfeature of the invention consists of grooves arranged in the crushingsurfaces, these grooves proceeding from the upper edge of each crushingplate and diverging downwards, tapering away into the surface of theplate at. some distance from the lower edge of it, so that the crushingsurfaces are smooth near the discharge gap. The ribs and teeth formed bythese grooves serve to disintegrate the material when it movesthroughthe crushing zone, and, at the same time, to spread it equallyall over the crushing surfaces.

, 50 A structure embodying the features of my invention is illustratedin the accompanying drawings forming 'a part of this specification, inwhich Fig. 1 is a vertical section of a jaw crusher; Fig. 2 is anelevation of the upper crushing 55 plate, on a-larger scale;

Fig. 3 is an elevation of the lower crushing plate, on the same scale asFig. 2.

Referring to the drawings, I is the machine frame having the yoke 2 in asloping position. This yoke forms the upper, non-moveable jaw. 5

3 is the lower jaw arranged in juxtaposition to the upper one; this jawis inclined, too, its inclination being, however, less than that of thejaw 2. The upper section of the jaw 3 is hinged at 4 to theframe I; thelower part is rocked by the power driven eccentric 5.

The jaws 2 and 3 are fitted respectively with crushing plates 6 and 1 oftrapezoid shape which are illustrated in Figs. 2 and 3. These plates 6and 1 form thus a space the length of which increases towards the lowergap, while its breadth decreases, so that the cross section of thecrushing zone increases downwards in the proportion as the volume of thematerial grows larger when being distintegrated.

The crushing plate 1 is arranged on the moveable jaw 3. The crushingsurface of the plate 6 secured to the stationary yoke 2 is stepped andprovided with grooves of triangular shape proceeding from the upper edgeof the plate 6 and tapering away into its surface at a distance from thelower edge.

By these grooves, ribs 8 are formed that have steps 9 and divergedownwards. The steps 9 diminish the height of the ribs 8 at intervals.

In the middle sectionof the plate, the bottom of each groove broadens.On this broadening bottom a tooth I0 is arranged being placed betweenthe ribs 8. The teeth lll taper away into the surface in the same manneras the ribs 8.

The lower zone of the surface of the crushing plate 6 is smooth.

The plate I is provided with similar ribs H and additional teeth l2,these ribs H having,

however, no steps. The exterior rib II on each lateral side of plate 1has only hall the cross section of the other ribs ll; thus, it has theshape of a right triangle. These exterior ribs ll form lateral rims thatprevent the material under treatment from'laterally falling down fromthe plate 1, whereby the space between the moveable jaw 3 and themachine frame i would be stopped. The lower part of the plate I has asmooth surface. The apparatus specified before operates as follows:

The material fed from above between the crushing plates 6 and 1 consistsof pieces of different size. Large pieces are crushed in the uppermostzone by the ribs 8 and II when the jaw 3 is rocked. Smaller pieces slidedown into the zone of the additional teeth I!) and I2 and aredisintegrated there together with the crushed parts coming from theupper zone. Fine particles fall immediately down and leave the crushingmeans by passing through the lowest zone which is enclosed by thesmoothparts of the plates 6 and l, as no stopping of the material can beeifected between these smooth-surfaces.

Other embodiments and numerous minor changes may be made by thoseskilled in the art withoutin the least departing from the. scope of myinvention.

I claim: v v

In a crusher of the type described, a machine frame having a transverseyoke with a sloping underside, a movable jaw arranged in said framebelow said yoke and in opposition thereto, means for rocking said jaw,and crushing plates broadening toward their lower ends, one of saidplates being secured to the underside of said yoke, the other platebeing arranged on said movable jaw, the surfaces of said plates being inthe form of alternating grooves and teeth extending downward from theupper zone of the plate to the lower zone adjacent the bottom edge ofsaid plate providing a smooth lower surface on the plate, the bottom ofeach groove broadening downward and all the teeth diverging downwardlywith respect to each other and tapering away into the surface of thelower zone of the plate, and additional teeth located respectively ineach of the broadening bottoms of said grooves, the upper ends of saidadditional teeth terminating in the medial zone of the plate and theirlower ends tapering away into the surface of the lower part of theplate.

KARL MEISTER.

